Which description characterizes a pneumatic system?

Which description characterizes a pneumatic system?

• A. A system that uses compressed air to power tools and control mechanisms such as doors, signal controls and train brakes.
• B. A system that uses high-pressure liquid to power hydraulics.
• C. A system that relies on gears to transmit motion.
• D. A system that stores electrical energy for later use.

Answer: (A)

Pneumatic systems rely on compressed air as the working fluid to power devices and control actions. This makes sense for tools and control elements like doors, signal controls, and train brakes because air can be quickly released or directed through valves to actuate cylinders and mechanisms, offering fast response and simple, lightweight components. The air is stored and compressed by a compressor, then regulated and routed to pneumatic actuators as needed. In contrast, a hydraulic system uses a liquid under pressure, not air; a system that relies on gears transmits motion mechanically; and storing electrical energy refers to batteries or capacitors, not pneumatics. So this description—compressed air powering tools and control mechanisms—best fits a pneumatic system.

Pneumatic systems rely on compressed air as the working fluid to power devices and control actions. This makes sense for tools and control elements like doors, signal controls, and train brakes because air can be quickly released or directed through valves to actuate cylinders and mechanisms, offering fast response and simple, lightweight components. The air is stored and compressed by a compressor, then regulated and routed to pneumatic actuators as needed. In contrast, a hydraulic system uses a liquid under pressure, not air; a system that relies on gears transmits motion mechanically; and storing electrical energy refers to batteries or capacitors, not pneumatics. So this description—compressed air powering tools and control mechanisms—best fits a pneumatic system.